Tool for rotating threaded articles



Jan. 20, 1948.

F. E. KNIGHT TOOL FOR ROTATING .THREADED ARTICLES Filed March 2l, 1946 Frank E. Kai [3h am by Mpmf-MH Patented Jan. 20, 1948 Y UNITED STAT Es PATENT VOFFICE:

amended April 30, 1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to an assembly tool and more particularly to a tool for assembling a threaded component.

When assembling certain components to an article of manufacture there is frequently encountered a component which is particularly diicult to assemble. This is especially true of bolts or nuts secured in inaccessible places. The conventional wrench or screw driver for use in removal of such components from such inaccessible places is either extremely difficult or impossible to use.

Accordingly, it is an object of this invention to provide a tool for assembling (or disassembling) certain threaded components to an article of manufacture.

A particular object of this invention is to provide an assembly tool for assembling the piston nut to a firearm known as the U. S. carbine, cal. .30, M1.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawings in which:

Fig. 1 is a side elevational view of the assembly tool shown in assembled relation to a firearm for removal of the threaded nut;

Fig. 2 is a view similar to Fig. 1 but rotated 90 to better show the manner of securing such tool to the receiver of a firearm;

Fig. 3 is a perspective view of the driver showing the castellated end thereof; and

Fig. 4 is a perspective view of the castellated piston retaining nut.

In Fig. 1 there is shown in assembled relation an assembly tool embodying this invention. The tool shown in such figure comprises mainly a body I, a screw II), and a driver 20. In the preferred application such tool is utilized to assemble or remove the piston retaining nut of a firearm known as the U. S. Carbine M1. Such is only a specific example however and should not be construed as limiting the invention to such application as the scope of the invention is suiliciently broad to include numerous similar applications.

Body I is a cylindrical member provided on one end with a bifurcated head 2. On the other end of such body, screw I is preferably integrally formed therewith and axially "disposed thereto. A transverse hole 3 is provided on head 2 for mounting such head to a receiver 4 of a firearm 55 2 as will be later described. Each end of hole 3 is counterbored as shown at 5 in Fig. 2. A flat portion 6 is provided on one side of body I and head 2 as shown in Fig. 1 to clear the bottom of receiver 4 when such tool is fastened to receiver 4.

The screw I0 integrally formed with body I' is provided with a thread having a lead identical with that of a piston retaining nut 1. Such nut is screwed into a threaded hole 8 in a gas cylinder 9 provided on the underside of a barrel Il of a firearm as illustrated in Fig. 1. Driver 20 is provided with a threaded axial hole I2 and such driver is screwed on to screw I0. The upper half of driver 20 is preferably of hexagonal shape as shown at I3 to permit a conventional open end wrench or other type of wrench to be placed about driver 20 to facilitate turning thereof. The lower end I4 of driver 20 is notched or castellated as shown in Fig. 3. Such notches correspond to the notched or castellated end of nut 1. Thus when the notched end I4 of driver 20 is in engagement with nut 1, nut 'l can be readily screwed in or removed as will be presently described.

To assemble or remove nut 1 from the cylinder 9 of the firearm shown in Figs. 1 and 2, the notched end I4 of driver 201s placed in engagement with nut 1. The bifurcated end of head 2 of body I is then placed about an integral lug I5 provided on the underside of receiver 4. A transverse hole I6 is provided in lug I5. When head 2 of body I` surrounds lug I5 and hole 3 is in alignment with hole I6, a headedpin I'I is inserted through hole 3 and hole I6 to secure body I to the underside of receiver 4. The head of headed pin I1 rests Within one of the counterbored ends 5 of hole 3. Thus the tool is mounted in position for assembly or removal of piston nut 1. To remove such nut a. conventional wrench is placed about the hexagonal portion I3 of driver 20 and such driver is rotated. Such rotation turns nut "I, this being possible because the lead of the thread provided on screw II) is identical to that of nut 'L From the foregoing description it is readily apparent that there is hereby provided a convenient tool for use in assembling or disassembling the piston nut of the U. S. Carbine, cal. .30, M1. It is also apparent that such a. tool can be readily modified to remove a screw or nut from a similarly difficult inaccessible location and yet lie within the scope of this invention.

I claim:

1. A tool for rotating a. threaded nut for assembly to the gas cylinder of a firearm having a barrel, a receiver, a depending lug on the receiver, the gas cylinder being in depending relation to the barrel and relatively inaccessible, said tool comprising, a body, a bifurcated head on one end of said body arranged to straddle the lug on the receiver of the firearm to non-rotatively secure the body to the firearm, a screw extending from the other end of said body and arranged to underlie the barrel of the firearm, said screw having a lead of thread corresponding to the lead 0f thread on the threaded nut, a driver threadably mounted on said screw, means on said driver for engaging said threaded nut, and means on said driver for engagement by a tool whereby rotation of said driver eiects rotation of said threaded nut for assembly or removal thereof to the gas cylinder.

2. A tool for rotating a castellated threaded nut for assembly to the gas cylinder of a firearm hav.- ing a barrel, a receiver, a depending lug on kthe receiver, the gas cylinder being in depending relation to the barrel and relatively inaccessible, said tool comprising, a'body, a bifurcated head on one fendof said body arranged to straddle the lug on the `receiver of the rearm to non-rotatively se- .cure the body to the firearm, a screw extending from the other end of said body and arranged to underlie the barrel of the iirearm, said screw hav.-

2,5 Number o thereof to the gas cylinder.

FRANK E. KNIGHT.

y,n EF,xt mirzorzs CITED The `following references are of record in the ifile ,0fl this retenir UNITED STATES PATENTS Name Date Senn June 10, 1902 vPotts June 5, 1923 Graham L Feb. 23, 1932 Parvin Mar. 10, 1936 Bowne Dec. V23,-1941 FOREIGN PATENTS Country Date Great UBritain Y--- Mar. 15, 1909 Number 

